Cavitation Resistant Polyurethane Coating Composition
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Solution Overview
Problem
Current materials and structures for propellers and rudders lack sufficient cavitation resistance, leading to erosion, noise, and reduced fuel efficiency, and existing cavitation-resistant coatings are costly and inefficient to apply.
Innovation Solution
A cavitation-resistant polyurethane composition comprising a urethane prepolymer and a second solution with specific weight percentages of polyol, nano-carbon, colorant, moisture absorbent, anti-wear agent, and defoaming agent, applied using a spray machine or cartridge air gun to form a coating film with improved workability and cost-efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing cavitation-resistant coating compositions are used, then cavitation resistance is improved, but cost increases and application time increases
Solution Approach 1:
The patent changes the chemical parameters of the coating composition by using polyol with average functional group number of at least 4 and specific weight percentages of additives (1-3% each of nano-carbon, colorant, moisture absorbent, anti-wear agent, and defoaming agent). This optimized formulation maintains cavitation resistance while improving application characteristics and reducing application time.
Solution Approach 2:
The patent creates a composite coating material combining polyol with multiple functional additives including nano-carbon, colorant, moisture absorbent, anti-wear agent, and defoaming agent. This composite formulation achieves both cavitation resistance and improved workability, resolving the contradiction between reliability and productivity.
2Reliability
If existing cavitation-resistant coating compositions are used, then cavitation resistance is improved, but application complexity increases
Solution Approach 1:
The patent optimizes the chemical parameters by selecting polyol with average functional group number of at least 4 and controlling the weight percentages of additives within specific ranges (1-3% each). This parameter optimization improves the coating's workability and ease of application while maintaining cavitation resistance.
Solution Approach 2:
The coating composition is formulated to be self-sufficient with all necessary components (polyol, nano-carbon, colorant, moisture absorbent, anti-wear agent, defoaming agent) already integrated, eliminating the need for complex multi-step application procedures and manual mixing, thereby improving ease of operation.
3Adaptability or versatility
If manual application methods are used, then coating flexibility is maintained, but application time increases significantly
Solution Approach 1:
The patent modifies the physical and chemical parameters of the coating formulation, including the weight percentages of components and the functional group numbers, to optimize both flexibility and application speed. The optimized composition maintains adaptability while reducing application time.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The polyurethane composition effectively enhances cavitation resistance, wear resistance, and mechanical properties while being cost-efficient and easy to apply, forming a coating film with improved durability and reduced erosion rates.
Implementation Method 1
The urethane prepolymer is synthesized by a polymerization of about 60 weight percent to about 70 weight percent of an isocyanate compound and about 30 weight percent to about 40 weight percent of a polyol
Implementation Method 2
The second solution comprises about 90 weight percent to about 95 weight percent of a polyol having an average functional group number of at least 4
Data Source
AI summary
A cavitation resistant polyurethane composition includes a first solution comprising a urethane prepolymer and a second solution. The urethane prepolymer is synthesized by a polymerization of about 60 to about 70 weight percent of an isocynate compound and about 30 to about 40 weight percent of a polyol. An average functional group number of the isocyanate compound is at least 2. The second solution includes about 90 to about 95 weight percent of a polyol having an average functional group number of at least 4, about 1 to about 3 weight percent of a nano-carbon, about 1 to about 3 weight percent of a colorant, about 1 to about 3 weight percent of a moisture absorbent, about 1 to about 3 weight percent of an anti-wear agent, and about 1 to about 3 weight percent of a defoaming agent.